From personal experience Spin Rewriter is the best! like I still use it today. Its so easy to use (Just copy paste and the program do everything) Because of this tool I managed to schedule content and articles for 3 years, do you know how much time and money I’ve saved?!?! A LOT!!! Also i high recommend you pick their mothly plan if you are still in doubt
I've ranked websites in the past with spun content, and now they are still on #1 position of google. First year (2014) google found me because my spun was really bad, many paragraphs were just copied and my position drop from #2 to around #20 after a panda update. Later I cleaned all my text with better spun (I didn't buy any article!), my ranking went up again, and with more backlinks I reached #1 and it is still there
It’s just okay. Maybe I expected too much but it did not save me much time at all with all the changes I had to make to the articles. I used it on the “readable” setting and allowed it to automatically spin paragraphs, sentences, etc. Well it was actually “readable” but not human readable, also there is option for human readable articles, but it will be not 100% unique.